CAPDM Tutorial Applets

Yield Curve

Functionality:

This applet allows users to view yield (as a percentage) of US govt. bonds for maturity periods of up to 30 years starting from March 1977 to January 1997. Plots can be shown in line or bar form.

Remote Control using JavaScript

JavaScript support is limited to showing version information for this applet.

Show January 1983 Yields

How to Invoke the Applet

The applet can be invoked by embedding an APPLET tag into your HTML document (if you look at the source of this document you will see a working example you can copy). The table below details the basic parameters used and additional startup parameters that are specific to this applet.

<APPLET 
  CODEBASE="../../../../classes"
  ALT="Yield Curve"
  CODE="applet.capdm.finance.yieldcurve.YieldCurveApp" 
  NAME="YieldCurve"
  WIDTH="360"
  HEIGHT="400">
  <PARAM NAME="DataFile" VALUE="data/capdm/finance/yieldcurve/yielddata.ser">
</APPLET>

Basic Parameters	Use
CODEBASE="../../../../classes"	The CODEBASE of the applet must point at the top-level classes directory in order for the applet to be found.
CODE="applet.capdm.finance. yieldcurve.YieldCurveApp"	This required attribute gives the name of the file that contains the applet's compiled Applet subclass. This file is relative to the base URI of the applet.
ALT="Yield Curve"	This optional attribute specifies any text that should be displayed if the browser understands the APPLET tag but can't run Java applets.
NAME="YieldCurve"	This optional attribute specifies a name for the applet instance, which makes it possible for applets on the same page to find (and communicate with) each other. If you intend to use JavaScript/Applet scripting then the applet must be named a shown.
WIDTH="360" HEIGHT="400"	These required attributes give the initial width and height (in pixels) of the applet display area, not counting any windows or dialogs that the applet brings up.
Applet Startup Parameters	Use
DataFile	Points to the Java serialised data file used by the applet to geneate graphs.

For more information on the use of the APPLET tag and other attributes you can use but which are not listed above, visit the W3.org specification page at: APPLET tag in HTML 4.

Runtime Applet API Calls

This applet can be called into using Javascript 1.1 while running. Although JavaScript can call the Applet directly, some convenient JavaScript functions have been created which deal with the details of the communication. The following table lists the call Names which can be made, and gives examples of their use and results.

API Call Name	Parameters	Use and Result
setValue(name,value)	'name' can be one of "ChartType" or "Year". 'value' can be "Bar" or "Line" in the case of "ChartType", and between 0 and 238 for "Year"	`javascript:setValue("Year",70);` Changes the Year to Jan 1983
showAbout()	none	`javascript:showAbout();` Shows the version dialog box of this applet.
reset()	none	`javascript:reset();` resets the applet to initial starting position
getValue()	none	`javascript:getValue();` Gets the status of the applet
getValue(name)	'name' can be one of "ChartType" or "Year".	`javascript:getValue("Year");` Gets the current Year - might return "Jan. 1983". Other examples: `javascript:getValue("ChartType");` might return "Line"
getValue(name,dp)	'name' can be one of "ChartType" or "Year". 'dp' is the number of decimal places of accuracy required - ignored in this applet	`javascript:getValue("Year",2);` Gets the current Year - might return "Jan. 1983". Other examples: `javascript:getValue("ChartType",0);` might return "Line"